Gib and wedge key for key bolts



Nov.7 26, 1929. l R. v. NORTHEY 1,737,091

GIB AND WEDGE KEY FOR KEY BOLTS Filed Nov. 4, 1927 INvENTmR.

JM'W

takes the place of a nut.

Patented Nov. 26, 1929 PATENT GFFCE Y RODNEY V. NORTHEY, 0F TORONTO, ONTARIO, CANADA GIB AND WEDGE KEY .FOR KEY BOLTS Application filed November 4, 1927.

This invention relates to gibs and wedge keys particularly adapted for use with a key bolt, that is, a bolt having its stem slotted for the passage of a wedge key which Such bolts are not ordinarily well adapted for use where much draft is required, as this necessitates either a very long key, or a key of steep pitch, and either alternative is objectionable. In my prior Patent 1,563,518 I show a construction intended to partially overcome the objection referred to.

My chief object in the present invention is to devise a construction of gib with which a shorter key may be employed.

It is also found that in some cases there is a tendency for the gib and key to move out of alinement as the key is driven, and a further object is to devise a construction in which this tendency is to a large extent avoided.

I attain my object by forming the gib from a tapered metal bar and bending the bar at one or more points, and by longitudinally grooving the contacting surface of either the gib or key and forming a rib on the contacting face of the other member.

rlhe invention is hereinafter more specitically described and illustrated in the accompanying drawings in which y Fig. 1 is a side elevat-ion of the improved gib and key used in connection with a key bolt, the latter being shown in section;

Fig. 2 a similar view showing the gib in another position;

Fig. 3 a side elevation of another form of Orib;

o Fig. l a side elevation of still another form of gib;

Fig. 5 a side elevation of the blank from which the gib is formed;

Fig. 6 a sectional view of the gib and key;

Fig. 7 a view similar to Fig. 6 showing a modified construction.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

1 is a bolt formed with a slot 2, and .3 is a wedge key. 'Ihe gib is formed from a tapered piece of metal as shown in Fig. 5

Serial No. 231,169.

and is preferably notched at 4 to facilitate bending.

In the form shown in Fig. 3, the gib is bent at one point to form in effect two connected gibs 5 and 6 lying at an angle to one another, while in the forms shown in Figs. 1,2 and G, the gib is bent at two points to form in effect three connected gibs 7, 8 and 9. In all forms the bar is preferably formed with a shoulder 10 at each end of the tapered side to prevent the gib slipping out while the key is being driven home. In the forms shown in Figs. 1 Vto 3 the straight sides of each portion of the gib lie at substantially an angle of 45o to one another, while in Fig. 4l the straight sides of the two outer portions lie at substantially a right angle to the straight side of the middle portion.

In Fig. 1 I illustrate in dotted linesthe gib before bending, and it will be readily apparent that driving of the wedge key may be continued to a point considerably closer to the bolt than is possible with the straight gib, and therefore a shorter wedge key may be employed to secure the same amount of draft.`

To prevent the gib and key working out of alinement during the driving operation, I form a longitudinal groove on the contacting face of one of the members, preferably the key thus forming a pair of spaced ribs, and a tongue on the contacting face of the gib. In Fig. G I show the groove and tongue as V-shaped and in Fig. 7 as rounded. rlhe groove in each case is preferably deeper than the tongue so that the sides of the tongue engage the sides of the ribs berore the tongue engages, the bottom of the groove. Hence, when driving the key home, there is a tendency for the tongue to cause the ribs to'spread,

thus effecting a greater frictional engagement between the parts which tends to preventthe accidental working loose of the key.

From the above description it will be seen that I have devised a construction of gib and Wedge key and gib, said Wedge key and gib having tongue and groove contacting surfaces tending to prevent transverse movement of the one relative to the other, the groove being deeper than the tongue whereby the sides of the latter tend to spread the sides of the groove when the key is driven longitudinally of the gib.

2. A slotted bolt having a straight-sided Wedge key extending through its slot in combination with a tapered. gib, also extending through the slot, said gib bent intermediate its ends to form a pair of key engaging portions lying at an angle to one another.

3. A slotted bolt and a straight-sided Wedge key extending through its slot in combination with a tapered gib also extending through the slot, said gib being bent at a plurality of points intermediate its ends to forml a plurality of key' contacting surfaces, any one of which may be brought inte parallel contact With the Wedge key and each lying at an angle tothe adjacent surface.

4*. Aslotted bolt and a Straight-sided Wedge key extending through its slot in combination with a tapered gib, also extending throughv the slot, said gib being bent intermediate it-s ends to form a. pair of key engagingportions lying at an angle to one another, said gib and key having tongue and groove .Contacting Surfaes tending to prevent transverseA movement of the one relative to the other.

5 A slotted bolt and Wedge key in combination with a tapered gib, Said sib bent, intermediate itsr @nds t0 ferm. a rail? Qf keyengan-v ingy portions. lying at an angle t0- on@ another, said gib and key having tongue and groove Contacting Surfaces, tending t0 'Preventv transverse gravement et the relativ@ t0 the other, the groove being deeper than the tongue whereby the sides of the latter tend to spread the sides ofthe groove when the key isdriven longitudinally of the gib.

6. The combination with a slotted bolt of a Wedge key member and gib member each extending through the slot, one of said mem bers having its surface which contacts with the other membergrooved to form a pair of spaced ribs extending longitudinally of the said member, said ribs being adapted to be spread apart by the other member when the members are being placed in wedged position.

7. The combination with a slotted bolt of a wedge key and gib, each extending through the slot, the gib contacting surface of the Wedge key being grooved to form a pair of spaced ribs extending longitudinally of the wedge key, said ribs beingadapted to, be spread apartby the gib when the wedge key isi being driven.

8. A slotted bolt having a straight-.sided Wedge key extending through its slot, in combination with a tapered gib, also extending through the slot, said gib bent intermediate its ends to form a plurality of key engaging portions lying at an angle to one another and having a boltengaging shoulder at each end thereof.

9. A tapered gib for use with a slotted bolt and a straight sided Wedge key, said gib having a plurality of Wedge portions arranged at anangle to one another, any of Which may be brought into parallel contact With the Wedge key, each Wedge portion forming a boltengaging shoulder for the end of the adjacent Wedge portion.

Signed at Toronto, Canada, this 18th day of August, 1927.

RQDNEY V. NORTHEY. 

